Prevention of silica migration in thermal insulation with water- soluble salts of inorganic oxygen-containing acids or acidic gases

摘要

In a process of manufacturing discrete, ceramic fiber insulation products, the steps of:PP(a) providing an alkali- stabilized water suspension of colloidal silica;PP (b) incorporating a water-soluble salt of an inorganic oxygen-containing acid in said suspension to form a modified suspension;PP (c) and either infusing said modified suspension into a pre-treated mat of alumino silicate fibers or infusing the alkali stabilized water suspension of colloidal silica into the pre-treated mat and then subjecting the thus-treated mat to an acidic gas; and then,P P(d) drying said mats.